Multistage balanced pump



- A. HOLLANDER HULTISTAGE BALANCED PUMP Oct. 4, 1927. I

Filed March 26. 1927 INVEINTOR,

Patented Oct. 4, 1927.

.- UNITED STATES. PATEN'IfQFFICEy ALADAR EOLL ANDER, OF BERKELEY, CALIFORNIA, ASSIGNOR TO BYRON JACKSON PUMP MFG. CO., OF BERKELEY, CALIFORNIA, A CORPORATION OF CALIFORNIA.

MULTISTAGE BALANCED PUMP.

Application filed March 26, 1927. Serial No. 178,724.

The principal object of my invention is to provide centrifugal pumplng means havlng an even number of stages in which the sev- A further .object is a pump of the char-- acter described in which the several stages are geared together and because of the positioning of the several parts, gears of minimum size may be employed.

Further objects will appear from the drawings and specification.

These objects I attain by positioning the impellers of successive stages to take the discharge directly from the high pressure side of the immediately preceding stage, by

' forming the casings of the successive stages overlapping and immediately adjacent and integral with each other. This :enables the shafts of the impellers of adjacent casings to be positioned apart a distancebut very slightly greater than the minimum radius of the .casing. In the prior art, where several pumping stages have been connected together, it has been the practice to separate the casings so that the distance between the shafts was greater than the diameter of the casings such practice requiring the use of large diameter gears whereas with my con-.

struction of overlapping the casings, much smaller diameter gears may be employed and less metal is required and less space necessary.

In the drawings: Fig. 1 is a plan view of a two stage centrifugal pump, employing my invention.

Fig. 2 is a plan view of a four stage centrifugal pump employing my invention and provided with connections enabling the pump to be operated as a four stage pump or as a pum aving two groups of two, stages each in arallel with each other.

Such a pump may therefore be employed to deliver a definite quantity of water' at a predetermined high pressure or substantially twice the quantity of water at half the pres- Fig. 3 is a side elevation of the pump of Fig. 2.

Throughout the figures similar numerals refer to identical parts.

A suction inlet is shown by the numeral 1 adapted to deliver water to the center of the casing 2.

The casing 2 is of scroll form and after passing the impeller therein fluid is delivered through the outer portion of the scroll of the casing 2, as at 3, to the suction side of the casing 4 and from the outer portion of the scroll of the casing 4 is delivered as pressure water through the delivery tercasing 4- is mounted upon the shaft 9.

Either one of these shafts is adapted to be driven by any conventional motor means and on their opposite ends are mounted respectively, the gears 10, 11 and therebetween the idler gear 12.

This latter may be operated as a driving gearin which case gears 10 and 11 become driven gears.

The distance between the gears 10 and 11 and therefore between the shafts 8 and 9 will now be a minimum because of the proximity or contacting of the portions 6 and 7 of the casing 4 and suction 1, and the immediate or direct connection at 3 between the scroll case 2 and the scroll case 4.

Where four stages are employed, a du plication of the casing and impeller parts of Fig. 1 is 'all that is required, thus a second suction inlet is provided at 15, a primary stage casing at 16, a second stage casing at 17 and a, second discharge at 18,-with impellers in 16 and 17 respectively, duplicates v 22,23 and opening the valve 21, fluid is conducted from the suction 15 through the stages, 16, '17 thence through the con- .nection '19,. 20 and'to the inlet of stage 2, from which it is delivered to stage 4 and thence as high pressure fluid through the discharge 'pipe 5, or with the valves 22 and 23 opened and the valve 21 closed, suction flows in at 1 and and is raised through its first stage of pressure in casings 2 and 16 respectively and ,thence passes'into stages 4 and 17 where it isagain raised through a second stage of pressure and is finally discharged through delivery connections 5, 18.

' first stage bein .the discharge r In the multi-stage pump of my invention it Will now be seen that the width required for two stages is substantially the same as for a single stage, the suction inlet for the om the second stage and the second stage suction being in the same plane as the volute of the first stage.

For the purpose of clarity I have not shown on the drawings any unessential parts and have indicated one method of connect ing sections of the casings together by flanges shown by the dotted lines at in Fig. 1, it being understood however, that the casings may be parted or otherwise sectionalized to suit the requirements and tastes of individ- -ual designers, while retaining portions of each ofthe adjacent casings cast integrally.

I claim: v- 1. In a two stage centrifugal pump, a pair of casings in parallel planes and overlapping each other and each having an inlet and an outlet, said casings formed with the outlet of each casing merging directly with the inlet of the casing of the next stage and of casings in. parallel planes and overlapsubstantially in line with ping each other and each having an inlet and an outlet, said casings formed with the outlet of each casing merging directly with the inlet of the casing of the next stage and the inlet of the first named casing substantially in the same plane with the outlet of the second named casing, a driving shaft in each casing and an external gear on each shaft and an intermediate gear between and meshingwith said external gears whereby the shafts areconstrained to rotate synchronously. a

4. A multistage centrifugal pump comprising a plurality of first stage impeller casings and a like plurality of second stage casings, each first stagecasings having a corresponding second stage casing adjacent each of said shafts and an intermediate gear between and meshing with said external gears whereby the shafts are constrained to rotate synchronously.

, 5. A multistage centrifugal pump comprisinga plurality of first stage impeller casings and a like plurality of second stage casings, each of first stage casings having a corresponding second stage casing adjacent thereto and as set forth in claim 1, a valve and a bypass between the inlet of each first stage and the periphery of each of said named casings. 1 a V 6. A multistage centrifugal pump comprising a plurality of first stage impeller casings and a like plurality of second stage casings each of first stage casings having acorresponding second stage casing adjacent thereto and as set forth in claim 1, a valve and a by ass between the inlet of each first stage an the periphery of each of said named casings, a common shaft for all of the first stage casings and a second shaft common to all of said second stage casings, an external gear on each of said shafts and an intermediate gear between and meshing with said external gears whereby the shafts are constrained to rotate synchronously.-

ALADAR HOLLANDER. 

